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Photosynthesis in phosphoenolpyruvate carboxykinase-type C4 plants: pathways of C4 acid decarboxylation in bundle sheath cells of Urochloa panicoides.

Abstract：

:The mechanism of C4 acid decarboxylation was studied in bundle sheath cell strands from Urochloa panicoides, a phosphoenolpyruvate carboxykinase (PCK)-type C4 plant. Added malate was decarboxylated to give pyruvate and this activity was often increased by adding ADP. Added oxaloacetate or aspartate plus 2-oxoglutarate (which produce oxaloacetate via aspartate aminotransferase) gave little metabolic decarboxylation alone but with added ATP there was a rapid production of PEP. For this activity ADP could replace ATP but only when added in combination with malate. In addition, the inclusion of aspartate plus 2-oxoglutarate with malate plus ADP often increased the rate of pyruvate production from malate by more than twofold. Experiments with respiratory chain inhibitors showed that the malate-dependent stimulation of oxaloacetate decarboxylation (PEP production) was probably due to ATP generated during the oxidation of malate in mitochondria. We could provide no evidence that photophosphorylation could serve as an alternative source of ATP for the PEP carboxykinase reaction. We concluded that both PEP carboxykinase and mitochondrial NAD-malic enzyme contribute to C4 acid decarboxylation in these cells, with the required ATP being derived from oxidation-linked phosphorylation in mitochondria.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Burnell JN,Hatch MD

doi

10.1016/0003-9861(88)90440-7

subject

Has Abstract

pub_date

1988-01-01 00:00:00

pages

187-99

issue

1

eissn

0003-9861

issn

1096-0384

pii

0003-9861(88)90440-7

journal_volume

260

pub_type

杂志文章

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